Instructions:
Prepare the lamprey: Begin by cleaning the lamprey. Cut off the head and carefully remove the intestines, keeping the blood if possible (this is key for the sauce). Rinse the fish thoroughly.
Sear the lamprey: In a large pot, heat the olive oil over medium-high heat. Sear the lamprey on all sides until golden brown (about 10 minutes). Remove and set aside.
Prepare the sauce: In the same pot, add the chopped onion and garlic, sautéing until softened, about 5 minutes. Stir in the tomato paste, bay leaf, thyme, and season with salt and pepper.
Deglaze and simmer: Pour in the red wine, scraping up any bits from the bottom of the pot. Let it reduce slightly for 5 minutes, then add the stock and bring to a simmer.
Cook the lamprey: Return the lamprey to the pot, ensuring it's submerged in the sauce. Cover and cook on low for about 45 minutes to 1 hour, until the fish is tender and cooked through.
Serve: Place the lamprey on a plate, spoon some of the rich sauce over it, and serve with slices of toasted bread to soak up the delicious juices.
Variations & Tips:
Vegan version: Use mushrooms (such as portobello or shiitake) as a substitute for the lamprey. While it won't replicate the texture, it will still provide a rich, umami-filled base for the dish.
Spicier: Add a pinch of red pepper flakes to the sauce for some heat.
Stock choice: If you're unable to find fish stock, chicken stock works well as an alternative.